2 research outputs found
Perovskite Solar Cells Using Carbon Nanotubes Both as Cathode and as Anode
Organic–inorganic
halide perovskite solar cells have received
much attention because they achieve high power conversion efficiencies
while providing the advantages of thin-film solar cells, namely, solution
processability and potentially low fabrication costs. However, at
the current level of halide perovskite solar cell technology, these
advantages cannot be maximized because of structural and material
limitations. Here, we provide a solution to these problems by replacing
conventional metal and metal oxide electrodes with carbon nanotube
electrodes. We also simplified the structure to achieve entirely solution-processable
perovskite solar cells. Through this study, we demonstrate the function
of carbon nanotubes as both the anode and the cathode in perovskite
solar cells. Economic modeling suggests that this novel architecture
reduces costs dramatically. This work realizes innovations in the
materials, costs, and processing of inverted-type perovskite solar
cells
Carbon Nanotubes versus Graphene as Flexible Transparent Electrodes in Inverted Perovskite Solar Cells
Transparent
carbon electrodes, carbon nanotubes, and graphene were
used as the bottom electrode in flexible inverted perovskite solar
cells. Their photovoltaic performance and mechanical resilience were
compared and analyzed using various techniques. Whereas a conventional
inverted perovskite solar cells using indium tin oxide showed a power
conversion efficiency of 17.8%, the carbon nanotube- and graphene-based
cells showed efficiencies of 12.8% and 14.2%, respectively. An established
MoO<sub>3</sub> doping was used for  carbon electrode-based devices.
The difference in the photovoltaic performance between the carbon
nanotube- and graphene-based cells was due to the difference in morphology
and transmittance. Raman spectroscopy, and cyclic flexural testing
revealed that the graphene-based cells were more susceptible to strain
than the carbon nanotube-based cells, though the difference was marginal.
Overall, despite higher performance, the transfer step for graphene
has lower reproducibility. Thus, the development of better graphene
transfer methods would help maximize the current capacity of graphene-based
cells